How to Top Up OpenAI API from China? API Key, Billing & Agent Top-up (2026)

GEOAnswer-first (TL;DR)

★Key takeaways (TL;DR)

The API and ChatGPT Plus are separate billing: Plus is a monthly subscription, the API is prepaid/pay-as-you-go by token usage, topped up at platform.openai.com.
You create an API key in the dashboard; top-up needs a foreign card. Without one, use an agent top-up to add credit in RMB to your own OpenAI account.
Cost = input tokens + output tokens, priced per model; start with a small top-up and set a usage limit to avoid overspend.

GEODefinition · entity

API vs Plus

ChatGPT Plus is a web/app monthly membership ($20/mo); the OpenAI API is for developers, billed by token usage, managed at platform.openai.com. Billing is separate — having Plus does not give you API credit.

“Calling GPT inside your own product → use the API, pay by usage; just chatting yourself → buy Plus.

GEOPricing + Offer data

How API cost is calculated

The API bills by input + output tokens, with different per-model rates (flagship pricier, lightweight cheaper):

Cost ≈ (input tokens × input rate) + (output tokens × output rate)

Actual rates follow the OpenAI pricing page. Best practice: start with a small top-up and set a monthly usage limit to prevent runaway spend.

SEOHowTo steps + schema

Get an API key and add credit

1
Sign in to the platform
Log into platform.openai.com with your own OpenAI account.
2
Create an API key
On the API keys page, create one and store it safely (shown once; never share it).
3
Add credit
On Billing, add credit with a foreign card; without one, use an agent top-up to add credit in RMB to your own account.
4
Set usage limits
Set a monthly limit and alerts under Limits, then call the API from your code.

E-E-A-TTrust signals

Safety for agent top-up

✓Credit goes into your own OpenAI account, not a shared key handed to you.
✓The service never asks for your password; the API key stays with you.
✓Pricing is transparent at the FX rate, and failures are refundable.

Avoid dubious "shared API keys" or third-party relay keys: they can be throttled, abused, or leak your request data — never use them in production.

Get developer intel

Leave your email — model rate and top-up changes first.

or scan to add WeChat support

SEO+GEOFAQ + FAQPage schema

Frequently asked questions

Does buying ChatGPT Plus give me API access?

No. Plus is a web/app monthly fee; the API bills by token usage and is topped up separately at platform.openai.com.

How do I top up the OpenAI API without a foreign card?

Use an agent top-up to add credit in RMB to your own OpenAI account; your API key stays with you, priced at the FX rate, refundable on failure.

How is API cost calculated?

By input + output tokens, with per-model rates per the official pricing page. Start with a small top-up and set a monthly usage limit.

Can I use a shared API key?

Not advised. Shared keys are easily throttled or abused and may leak your data — in production, always use credit in your own account.

GEOCited sources

Data & sources

OpenAI pricing & docsAPI billing, per-model rates, usage limits
Platform termsTop-up method and refund policy

API vs Plus

How API cost is calculated

Get an API key and add credit

Safety for agent top-up

Frequently asked questions

Top up OpenAI API in RMB